Transcript
1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
FEATURES
SOT-223 PKG
Fixed and adjustable output voltages to 1.24V 410mV typical dropout at 1A Ideal for 3.0V to 2.5V conversion Ideal for 2.5V to 1.8V or 1.5V conversion 1A minimum guaranteed output current 1% initial accuracy Low ground current Current limiting and thermal shutdown Reversed-battery protection Reversed-leakage protection Fast transient response Low-profile SOT-223 package Moisture Sensitivity Level 3
TO-252 3L / 5L PKG
SOP-8 PKG
ORDERING INFORMATION Device LM39100S-X.X LM39100GS-X.X LM39100RS-X.X LM39100GRS-X.X LM39101RS-X.X LM39101GRS-X.X LM39102RS LM39102GRS LM39101D-X.X LM39102D
APPLICATION
Battery Powered Equipments Motherboards and Graphic Cards Microprocessor Power Supplies Peripheral Cards High Efficiency Linear Regulators Battery Chargers
DESCRIPTION
Package SOT-223 TO-252 3L
TO-252 5L
SOP-8
X.X = Output Voltage = 1.5, 1.8, 2.5, 3.3, 5.0 The LM39100/1/2 is 1A low-dropout linear voltage regulators that provide low-voltage, high-current output. The LM39100/1/2 offers extremely low dropout (typically 410mV at 1A) and low ground current (typically 12mA at 1A). The LM39100 is a fixed output regulator offered in the SOT-223 package. The LM39101 and LM39102 are fixed and adjustable regulators, respectively, in SOP-8 and TO-252 Packages. The LM39100/1/2 is ideal for PC add-in cards that need to convert from standard 5V to 3.3V, 3.3V to 2.5V or 2.5V to1.8V. A guaranteed maximum dropout voltage of 630mV overall operating conditions allows the LM39100/1/2 to provide2.5V from a supply as low as 3.13V and 1.8V from a supply as low as 2.43V. The LM39100/1/2 is fully protected with over current limiting, thermal shutdown, and reversed-battery protection. Fixed voltages of 5.0V, 3.3V, 2.5V, 1.8V and 1.5V are available on LM39100/1 with adjustable output voltages to 1.24V on LM39102.
Absolute Maximum Ratings (Note 1) CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Supply Voltage
VIN
- 0.3
+ 20
V
Enable Voltage
VEN
-
+ 20
V
Output Voltage
VOUT
-0.3
VIN +0.3
V
Lead Temperature (Soldering, 5 sec)
TSOL
-
260
Storage Temperature Range
TSTG
-65
+ 150
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
Operating Ratings (Note 2) CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Supply Voltage
VIN
+ 2.25
+ 16
V
Enable Voltage
VEN
+ 2.25
+ 16
V
PD(max)
(Note 3)
(Note 3)
TJ
-40
+ 125
Maximum Power Dissipation Junction Temperature
115
/W
JA-TO252
95
/W
JA-SOP-8
130
/W
JA-SOT-223
Package Thermal Resistance
Ordering Information VOUT
1.5 V
1.8 V
2.5 V
3.3 V
Package
Order No.
Description
Supplied As
Status
SOT-223
LM39100S-1.5V
1A, Fixed
Reel
Active
SOT-223
LM39100GS-1.5V
1A, Fixed
Reel
Contact us
TO-252 3L
LM39100RS-1.5V
1A, Fixed
Reel
Active
TO-252 3L
LM39100GRS-1.5V
1A, Fixed
Reel
Active
TO-252 5L
LM39101RS-1.5V
1A, Fixed, Enable
Reel
Active
TO-252 5L
LM39101GRS-1.5V
1A, Fixed, Enable
Reel
Active
SOP-8
LM39101D-1.5V
1A, Fixed, Enable
Reel
Active
SOT-223
LM39100S-1.8V
1A, Fixed
Reel
Active
SOT-223
LM39100GS-1.8V
1A, Fixed
Reel
Contact us
TO-252 3L
LM39100RS-1.8V
1A, Fixed
Reel
Active
TO-252 3L
LM39100GRS-1.8V
1A, Fixed
Reel
Active
TO-252 5L
LM39101RS-1.8V
1A, Fixed, Enable
Reel
Active
TO-252 5L
LM39101GRS-1.8V
1A, Fixed, Enable
Reel
Active
SOP-8
LM39101D-1.8V
1A, Fixed, Enable
Reel
Active
SOT-223
LM39100S-2.5V
1A, Fixed
Reel
Active
SOT-223
LM39100GS-2.5V
1A, Fixed
Reel
Contact us
TO-252 3L
LM39100RS-2.5V
1A, Fixed
Reel
Active
TO-252 3L
LM39100GRS-2.5V
1A, Fixed
Reel
Active
TO-252 5L
LM39101RS-2.5V
1A, Fixed, Enable
Reel
Active
TO-252 5L
LM39101GRS-2.5V
1A, Fixed, Enable
Reel
Active
SOP-8
LM39101D-2.5V
1A, Fixed, Enable
Reel
Active
SOT-223
LM39100S-3.3V
1A, Fixed
Reel
Active
SOT-223
LM39100GS-3.3V
1A, Fixed
Reel
Contact us
TO-252 3L
LM39100RS-3.3V
1A, Fixed
Reel
Active
TO-252 3L
LM39100GRS-3.3V
1A, Fixed
Reel
Active
TO-252 5L
LM39101RS-3.3V
1A, Fixed, Enable
Reel
Active
TO-252 5L
LM39101GRS-3.3V
1A, Fixed, Enable
Reel
Active
SOP-8
LM39101D-3.3V
1A, Fixed, Enable
Reel
Active
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
Ordering Information VOUT
5.0 V
ADJ
Package
Order No.
Description
Supplied As
Status
SOT-223
LM39100S-5.0V
1A, Fixed
Reel
Active
SOT-223
LM39100GS-5.0V
1A, Fixed
Reel
Contact us
TO-252 3L
LM39100RS-5.0V
1A, Fixed
Reel
Active
TO-252 3L
LM39100GRS-5.0V
1A, Fixed
Reel
Active
TO-252 5L
LM39101RS-5.0V
1A, Fixed, Enable
Reel
Active
TO-252 5L
LM39101GRS-5.0V
1A, Fixed, Enable
Reel
Active
SOP-8
LM39101D-5.0V
1A, Fixed, Enable
Reel
Active
TO-252 5L
LM39102RS
1A, Adjustable, Enable
Reel
Active
TO-252 5L
LM39102GRS
1A, Adjustable, Enable
Reel
Active
SOP-8
LM39102D
1A, Adjustable, Enable
Reel
Active
LM 3910X
Output Voltage : 1.5V / 1.8V / 2.5V / 3.3V / 5.0V / Blank(ADJ Only) S : SOT-223 RS : TO-252 D : SOP-8
Package Type
Green Mode
G : Halogen Free Blank : Pb Free
Root Name
39100 : 3L Fixed Output 39101 : 5L Fixed Output 39102 : 5L / 8L Adjustable Output
Product Code
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
PIN CONFIGURATION
EN
1
8
GND
VIN
2
7
GND
VOUT
3
6
GND
FLG/ADJ
4
5
GND
SOP-8
VOUT
3
2
GND (TAB)
2
GND (TAB)
1
VIN
1
VIN
SOT-223
5
FLG/ADJ
4
VOUT
3
GND (TAB)
2
VIN
1
EN
VOUT
3
TO-252 3L
TO-252 5L
PIN DESCRIPTION SOT-223 & TO-252 3L (for 39100) Pin No. Name
Function
1
VIN
Input Supply
2
GND
Ground
3
VOUT
Output Voltage
TO-252 5L (for 39101/2)
SOP-8 (for 39101/2)
Pin No. Name
Function
Name
Function
1
EN
Chip Enable
EN
Chip Enable
2
VIN
Input Supply
VIN
Input Supply
3
GND
Ground
VOUT
Output Voltage
4
VOUT
Output Voltage
FLG / ADJ
Error Flag Output or Output Adjust
5
FLG / ADJ
Error Flag Output or Output Adjust
GND
Ground
6/7/8
-
-
GND
Ground
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
TYPICAL APPLICATION 100k
Error Flag Output
LM39100
LM39101 3.3V
IN
2.5V
OUT
3.3V
GND
IN
Enable Shutdown
2.5V / 1A Regulator
OUT
EN
2.5V
FLG GND
2.5V / 1A Regulator with Error Flag
LM39102 2.5V Enable Shutdown
IN
1.5V
OUT R1
EN
ADJ GND
R2
1.5V / 1A Adjustable Regulator
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
ELECTRICAL CHARACTERISTICS VIN= VOUT +1V; VEN = 2.25V; TJ = 25°C, bold values indicate -40°C
Symbol VOUT
VOUT/ T
Parameters
TJ
+125°C; unless noted
Condition
Min.
IOUT(lim)
Unit
1 2
% %
10mA 10mA ≤ IOUT ≤ 1A, VOUT+1V ≤ VIN ≤8V
Line Regulation
IOUT=10mA, VOUT +1V ≤ VIN ≤ 16V
0.06
0.5
%
Load Regulation
VIN= VOUT +1V, 10mA ≤ IOUT ≤ 1A
0.2
1
%
40
100
ppm/ °C
150
200 250
mV mV
-1 -2
Output Voltage Temp. Coefficient (Note 4)
Dropout Voltage (Note 5)
IOUT=500mA, VOUT = -1%
275
IOUT=750mA, VOUT = -1%
330
500
mV
410
550 630
mV mV
IOUT=1A, VOUT = -1%
IGND
Max.
Output Voltage
IOUT=100mA, VOUT = -1%
VDO
Typ.
Ground Current (Note 6)
Current Limit
mV
IOUT=100mA, VIN= VOUT+1V
700
A
IOUT=500mA, VIN= VOUT+1V
4
mA
IOUT=750mA, VIN= VOUT+1V
7
mA
VOUT=0V, VIN=VOUT+1V
1.3
2.5
3.5
A
0.8
V
Enable Input logic low (off) VEN
Enable Input Voltage logic high (on)
1
15
30 75 2 4
IOUT =10mA, VIN =VOUT +1V, VEN =0V to VIN
50
500
IOUT =500mA, VIN =VOUT +1V, VEN =0V to VIN
250
2000
IOUT =1.0A, VIN =VOUT +1V, VEN =0V to VIN
350
3000
0.01
1 2 300 400
VEN=2.25V IEN
V
2.25
Enable Input Current VEN=0.8V
TEN
Delay time to Nominal Output Voltage (Note 7)
A A A A
s
Flag Output IFLG (leak) VFLG (do)
VFLG
Output Leakage Current Output Low Voltage
VOH=16V
(Note 8)
VIN=0.9.VOUT NOMINAL, IOL=250 A
Low Threshold
% of VOUT
High Threshold
% of VOUT
93
% 99.2
Hysteresis
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240
1
-6
-
A A mV mV
% %
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
LM39102 Only 1.228 1.215
Reference Voltage (Note 9)
1.24
1.203
Adjust Pin Bias Current
40
Reference Voltage Temp. Coefficient (Note 4)
20
Adjust Pin Bias Current Temp. Coefficient
0.1
1.252 1.265
V V
1.277
V
80 120
nA nA ppm/ °C
99.2
nA/ °C
Note 1. Exceeding the absolute maximum ratings may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. PD (max)= (TJ (max) - TA) ÷
, where
JA
JA
-junction-to-ambient thermal resistance.
Note 4. Output voltage temperature coefficient is VOUT (worst case) ÷ (TJ(max) - TJ(min)) where TJ(max) is +125°C and TJ(min) is 0°C. Note 5. VDO = VIN - VOUT when VOUT decreases to 99% of its nominal output voltage with VIN = VOUT + 1V. For output voltages below 2.25V, dropout voltage is the input-to-output voltage differential with the minimum input voltage being 2.25V. Minimum input operating voltage is 2.25V. Note 6. IGND is the quiescent current. IIN = IGND + IOUT. Note 7. Delay time is measured after VEN=VIN.
CIN=COUT=10 F.
Note 8. For adjustable device and fixed device with VOUT ≥ 2.5V Note 9. VREF ≤ VOUT ≤ (VIN - 1V), 2.25V ≤ VIN ≤ 16V, 10mA ≤ IL ≤ 1 A.
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
TYPICAL OPERATING CHARACTERISTICS
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
TYPICAL OPERATING CHARACTERISTICS
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
APPLICATION INFORMATION The LM39100/1/2 is a high-performance low-dropout voltage regulator suitable for moderate to high-current voltage regulator applications. Its 630mV dropout voltage at full load and over temperature makes it especially valuable in battery-powered systems and as high-efficiency noise filters in post-regulator applications. Unlike older NPN-pass transistor de-signs, where the minimum dropout voltage is limited by the base-to-emitter voltage drop and collector-to-emitter saturation voltage, dropout performance of the PNP output of these devices is limited only by the low VCE saturation voltage. A trade-off for the low dropout voltage is a varying base drive requirement. The LM39100/1/2 regulator is fully protected from damage due to fault conditions. Linear current limiting is provided. Output current during overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the maximum safe operating temperature. Transient protection allows device (and load) survival even when the input voltage spikes above and below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. Output Capacitor The LM39100/1/2 requires an output capacitor to maintain stability and improve transient response. Proper capacitor selection is important to ensure proper operation. The LM39100/1/2 output capacitor selection is dependent upon the ESR (equivalent series resistance) of the output capacitor to maintain stability. When the output capacitor is 10 F or greater, the output capacitor should have an ESR less than 2 . This will improve transient response as well as promote stability. Ultra-low ESR capacitors (<100m ), such as ceramic chip capacitors, may promote the instability. These very low ESR levels may cause an oscillation and/or underdamped transient response. A low ESR solid tantalum capacitor works extremely well and provides a good transient response and the stability over the temperature range. Aluminum electrolytes can also be used, as long as the capacitor ESR is <2 . The value of the output capacitor can be increased without limit. Higher capacitance values help one to improve transient response and ripple rejection and reduce an output noise. Input Capacitor An input capacitor of 1 F or greater is recommended when the device is more than 4 inches away from the bulk ac supply capacitance or when the supply is a battery. In the case of ceramic chip capacitor, 10uF capacitance is recommended. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage. Error Flag The LM39101 features an error flag (FLG), which monitors the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions and may sink up to 10mA. Low output voltage signifies a number of possible problems, including an over current fault (the device is in current limit) or low input voltage. The flag output is inoperative during over temperature conditions. A pull-up resistor from FLG to either VIN or VOUT is required for proper operation. For information regarding the minimum and maximum values of pull-up resistance, refer to the graph in the typical characteristics section of the data sheet.
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
Enable Input The LM39101 and LM39102 versions feature an active-high enable input (EN) that allows on-off control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only micro amperes of leakage current. The EN input has TTL/CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to VIN and pulled up to the maximum supply voltage Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion The LM39100/1/2 has excellent transient response to variations in input voltage and load current. The device has been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 10µF output capacitor, preferably tantalum, is all that is required. Larger values help to improve performance even further. By virtue of its low-dropout voltage, this device does not saturate into dropout as readily as similar NPNbased de-signs. When converting from 3.3V to 2.5V or 2.5V to 1.8V, the NPN based regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater. To convert down to 2.5V or 1.8V without operating in dropout, NPN-based regulators require an input voltage of 3.7V at the very least. The LM39100 regulator will provide excellent performance with an input as low as 3.0V or 2.5V respectively. This gives the PNP based regulators a distinct advantage over older, NPN based linear regulators. Minimum Load Current The LM39100/1/2 regulator is specified between finite loads. If the output current is too small, leakage currents dominate and the output voltage rises. A 10mA minimum load current is necessary for proper regulation. Adjustable Regulator Design The LM39102 allows programming the output voltage any-where between 1.24V and the 16V maximum operating rating of the family. Two resistors are used. Resistors can be quite large, up to 1M , because of the very high input impedance and low bias current of the sense comparator: The resistor values are calculated by : R1=R2(Vout/1.240-1) Where Vout is the desired output voltage. Figure 1 shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation (see below). The current consumed by feedback resisters R1 and R2 is calculated by: Ires = Vout / (R1+ R2). LM39102 VIN Enable Shutdown
IN
VOUT
OUT R1
EN
ADJ GND
R2
C OUT
Figure 1. Adjustable Regulator with Resistors Maximum Output Current Capability The LM39100/1/2 can deliver a continuous current of 1A over the full operating junction temperature range. However, the output current is limited by the restriction of power dissipation which differs from packages. A Feb. 2012 - Rev. 1.5.3
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1A Low-Voltage Low-Dropout Regulator
LM39100/39101/39102
heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. With respect to the applied package, the maximum output current of 1A may be still undeliverable due to the restriction of the power dissipation of LM39100/1/2. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The temperatures over the device are given by: TC = TA + PD X
CA /
TJ = TC + PD X
JC /
TJ = TA + PD X
JA
Where TJ is the junction temperature, TC is the case temperature, TA is the ambient temperature, PD is the total power dissipation of the device, CA is the thermal resistance of case-to-ambient, JC is the thermal resistance of junction-to-case, and JA is the thermal resistance of junction to ambient. The total power dissipation of the device is given by: PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT) = (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + VIN X IGND Where IGND is the operating ground current of the device which is specified at the Electrical Characteristics. The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax = TJmax – TAmax The maximum allowable value for junction-to-ambient thermal resistance, formula: JA =
JA,
can be calculated using the
TRmax / PD = (TJmax – TAmax) / PD
LM39100/1/2 is available in SOT-223, TO-252, and SOP-8 package. The thermal resistance depends on amount of copper area or heat sink, and on air flow. If the maximum allowable value of JA calculated above is over 115°C/W for SOT-223 package, 95°C/W for TO-252 package, 130°C/W for SOP-8 package, no heat sink is needed since the package can dissipate enough heat to satisfy these requirements. If the value for allowable JA falls near or below these limits, a heat sink or proper area of copper plane is required. In summary, the absolute maximum ratings of thermal resistances are as follow: Absolute Maximum Ratings of Thermal Resistance Characteristic
Symbol
Rating
Unit
Thermal Resistance Junction-To-Ambient / SOT-223
JA-SOT-223
115
°C/W
Thermal Resistance Junction-To-Ambient / TO-252
JA-TO-252
95
°C/W
JA-SOP-8
130
°C/W
Thermal Resistance Junction-To-Ambient / SOP-8 2
No heat sink / No air flow / No adjacent heat source / 20 mm copper area. (TA=25°C)
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1A Low-Voltage Low-Dropout Regulator
Thermal Resistance( JA) vs. Copper Area (SOP-8)
Power Disspation(Pd) vs. Copper Area (SOP-8) @ TJ=125
140
JA( /W)
Power disspation, Pd (W)
1.6
LM39100/39101/39102
1.4
Thermal Resistance,
1.2 1
0.8 0.6
120
100
80
60
40
0.4 10
100
2
10
1000
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1000
Copper Area (mm2)
Copper Area (mm )
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